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United States Patent | 5,293,542 |
Ise ,   et al. | March 8, 1994 |
A video camera in which an iris in an optical system is composed of a plurality of diaphragms, and at least two of the plurality of diaphragms are respectively provided with a light amount limiting filter such that the light amount limiting filters attached on the at least two diaphragms completely surround a transparent portion when the iris is half closed, to thereby provide satisfactory characteristics of the optical system when the iris is half closed.
Inventors: | Ise; Koichi (Chiba, JP); Tomita; Yoshinori (Chiba, JP) |
Assignee: | Sony Corporation (Tokyo, JP) |
Appl. No.: | 718970 |
Filed: | June 21, 1991 |
Jun 25, 1990[JP] | P166380 |
Current U.S. Class: | 348/363; 348/335; 359/739; 396/449; 396/458; 396/484; 396/505; 396/510 |
Intern'l Class: | H04N 005/238; H04N 005/30 |
Field of Search: | 358/228,209 354/228,230,246,270,274,295,296 359/739 |
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2465578 | Mar., 1949 | Czarnikow et al. | 354/274. |
3377427 | Apr., 1968 | Fischer | 358/228. |
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4113359 | Sep., 1978 | Koike et al. | 350/269. |
4298265 | Nov., 1981 | Tanaka et al. | 354/246. |
4319821 | Mar., 1982 | Tezuka et al. | 354/230. |